Eric Leifer of National Geographic Young Explorers :
Fiordland National Park, tucked away far within New Zealand’s South Island, has the notorious claim to fame as one of the wettest locations in the southern hemisphere; and with a mean annual rainfall of 268 inches …
Throw yourself off the deep end by accepting the challenge of the country’s hardest trail, the infamous Dusky Track, an 84-kilometer route that impossibly forces its way through this impermeable landscape. …
besthike.com 
Great account of the trail. But no mention of the chain rope you need to cling to in order to get up a cliff that people who’ve done the Dusty have told me about. Beyond my capabilities I fear!